LOAD CURVE

 

Description: This function defines and modifies the load curves for a nonlinear analysis. The LOAD CURVE command requires several levels of submenus.

 

Usage:

        1.    DSI displays the Load Curve option menu as below figure

10-27

Figure 9.4.8.1 Load Curve Option Menu

 

2.  After the user selects a command, DSI lists a set of options specific to that command.

 

-CREATE

 

Description: This function allows the user to create load curves.

 

Usage:

1.      DSI displays the CURVE DEFINITION CARD, allowing the user to define the      load curve.

> ENTER LOAD CURVE NUMBER (xxxx) OR -1 TO EXIT

> ENTER CURVE NAME (UP TO 8 CHARACTERS)

· DSI recommends using the extension .lcr for this command.

 

2.  DSI prompts:

> ENTER DATA (TIME & VALUE) FOR POINT XXXX OR END

· Where XXXX is the point number and the input format is TIME, VALUE.

 

3.    DSI displays the curve operations:

 

 

Figure 9.4.8.2 Curves Operations Menu

       

-DELETE

 

Description: This function allows the user to delete load curves.

 

Usage:

1. DSI displays the DEFINE CURVE CARD LIST and prompts:

         > SELECT CARD TO DELETE

 

2. EXIT deletes the selected load curves from the database.

 

-ERASE UNREF.CURVE

 

Description: This function will delete all functions that have not been used in model.

 

-LIST

 

Description: This function lists the available load curves in the DEFINE CURVE CARD LIST.

 

-MODIFY

 

Description: This function allows the user to quickly modify points on a defined curve.

 

Usage:

1.  DSI lists the curves in the DEFINE CURVE CARD LIST, and prompts:

         > SELECT CURVE FROM CURVE LIST

 

2.      After selecting the curve, the CURVE DEFINITION CARD appears, allowing the user to edit the curve data.

 

-READ CURVE

 

Description: This function imports existing curve data into the DSI database.

 

Usage:

1. DSI displays the DSI FILE MENU, allowing the user to enter the curve (.cur) file.

 

2. Once the curve file is selected and the data is read in, DSI displays the DEFINE CURVE CARD LIST.  The user has the choice of selecting the curves before they are plotted.

 

Note: The load curve database format is shown below.  ALL text must be entered with CAPITAL letters.

 

-LOAD CURVE FILE FORMAT

 

line 1:                  $ DSI LOAD CURVE  (Header line)

line 2:                  CURVE,CURVE ID,TYPE,CURVE TITLE(A5,I5,I5,1X,A8)

line 3:                  X1, Y1  (2F10.4)

line 4:                  X2, Y2  (2F10.4)

line 5:                  X3, Y3  (2F10.4)

                         etc.

line n:                 CURVE,CURVEID,TYPE,CURVETITLE(Repeat a new curve)

line n+1:             X1, Y1  (2F10.4)

line n+2:             X2, Y2  (2F10.4)

line n+3:             X3, Y3  (2F10.4)

etc.

last line:              END (A3) (Terminate Input)

 

 

Where:

CURVE:                Header (Required).

CURVE ID:            Load Curve Number

TYPE:                   Curve Type (0- Transient Analysis; 1- Stress Initialization)

CURVE TITLE:      Curve's Title (User Defined)

X1, Y1:                 Curve Point 1

X2, Y2:                 Curve Point 2

END:                    Header (Required)

 

The following is an example of the LOAD CURVE file:

 

$DSI LOAD  CURVE

CURVE   2    0 CURVE  2

    0.0000    0.0000

    1.0000    1.5000

    2.0000   -0.0000

    3.0000    0.5000

    4.0000   -1.5000

CURVE 4    0 CURVE  4

    0.0000    2.0000

    6.0000   -3.5000

    7.0000    1.5000

    8.0000    2.0000

END

 

 

-RENUMBER

 

Description:This function allows user to renumber load curves.

 

Usage:

 

1.DSI prompts:

   >   SELECT OPTION

   ?    AUTOMATIC ALL

          ONE BY ONE

          SELECT ONE

          EXIT

 

 

-SHOW CURVE

 

Description: This function displays load curves.

 

Usage:

               1.   DSI displays the DEFINE CURVE CARD LIST.

               2.   After selecting a curve, DSI displays the following curve operations:

 

 

These options are explained in GRAPH

 

-CHECK SUSPENSION CURVE

 

Description: This function checks curves used in suspension bushing.